Several thoughts. There's a detailed tutorial on setting audio levels
for digital modes at
http://k9yc.com/USB_Interfaces.pdf
It also includes advice about making suitable attenuators.
I've found adapters on amazon to split a TRRS jack into mic in and line
out connectors. I seem to recall the brand was Star. They're pretty
light weight, and I haven't used them (wanted them for the ready box),
so I have no idea how well they will hold up. But they're cheap enough
to buy two. :)
Based on my testing, that good, low cost Numark listed is a very good
unit for our purposes, and can significantly improve decoding as
compared to internal sound cards.
BTW -- the noise you describe is often caused by failure to bond the
computer to the radio.
73, Jim K9YC
On Wed,4/5/2017 10:02 AM, Dave B via Elecraft wrote:
Run the PC's output at a relatively high level, but not into distortion
(test with headphones, so as to swamp any spurious PC related noises.)
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